package com.example.Lezedata.util;

import java.util.ArrayList;
import java.util.Stack;

import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;

import com.example.Lezedata.ui.activity.baseClass.GBBaseVc;

public class GBActivityManager {
    private static Stack<Activity> activityStack;
    private static GBActivityManager instance;

    public GBBaseVc currentVc;

    private GBActivityManager(){}
    /**
     * 单一实例
     */
    public static GBActivityManager sharedManager(){
        if(instance==null){
            instance=new GBActivityManager();
        }
        return instance;
    }
    /**
     * 添加Activity到堆栈
     */
    public void addActivity(Activity activity){
        if(activityStack==null){
            activityStack=new Stack<Activity>();
        }
        activityStack.add(activity);
    }
    /**
     * 获取当前Activity（堆栈中最后一个压入的）
     */
    public Activity currentActivity(){
        Activity activity=activityStack.lastElement();
        return activity;
    }

    /*
       返回指定Class Vc
    */
    public void backToActivity(Class<?> cls){
        ArrayList<Activity> activities = new ArrayList<>();
        for (int i = activityStack.size() - 1; i >= 0; i--){
            if (null != activityStack.get(i)){
                Activity activity = activityStack.get(i);
                if(activity.getClass().equals(cls) ){
                    break;
                }else {
                    activities.add(activity);
                }
            }
        }
        for (Activity activity:activities){
            finishActivity(activity);
        }
    }

    /**
     * 结束当前Activity（堆栈中最后一个压入的）
     */
    public void finishActivity(){
        Activity activity=activityStack.lastElement();
        finishActivity(activity);
    }
    /**
     * 结束指定的Activity
     */
    public void finishActivity(Activity activity){
        if(activity!=null){
            activityStack.remove(activity);
            activity.finish();
            activity=null;
        }
    }
    /**
     * 结束指定类名的Activity
     */
    public void finishActivity(Class<?> cls){
        for (Activity activity : activityStack) {
            if(activity.getClass().equals(cls) ){
                finishActivity(activity);
            }
        }
    }
    /**
     * 结束所有Activity
     */
    public void finishAllActivity(){
        for (int i = 0, size = activityStack.size(); i < size; i++){
            if (null != activityStack.get(i)){
                activityStack.get(i).finish();
            }
        }
        activityStack.clear();
    }
    /**
     * 退出应用程序
     */
    public void AppExit(Context context) {
        try {
            finishAllActivity();
            ActivityManager activityMgr= (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
            activityMgr.restartPackage(context.getPackageName());
            System.exit(0);
        } catch (Exception e) {    }
    }
}
